Fujino: I've forgotten the exact date... (laughs) but it was when we were both working at Konami. About 10-15 years ago. Toshiaki Fujino with a copy of theDeltaZeal and XIIZeal X360 ports. Naoto: We worked together on the same project, Seishōjo Kantai Virgin Fleet. At the time we didn't have any particularly close contact though.
Triangle Service - 2013 Developer Interview
http://shmuplations.com/triangleservice This lengthy interview with director Toshiaki Fujino and composer Naoto covers both their 10 year history and their pre-Triangle Service time at Konami and elsewhere. In addition to explaining certain design choices in DeltaZeal and XIIZeal, Fujino gives his unique perspective as one of the few independent companies making STGs in the last 15 years.